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Stabilized solidification and setting accelerator for hydraulic binders

a technology of hydraulic binders and stabilizing solidification, which is applied in the direction of climate sustainability, solid waste management, sustainable waste treatment, etc., can solve the problems of reducing the ultimate strength and long-term adhesiveness of concrete, unwanted harm to the user, and increasing production costs

Active Publication Date: 2017-03-30
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention features accelerators that have a high stability in solution and can achieve high strengths quickly. Compared to conventional accelerators, the invention's accelerators require less acid and are more effective. This makes them more favorable for use in various applications.

Problems solved by technology

In the case of the substances giving a strongly alkaline reaction, however, unwanted harm to the user, such as burns, may occur, and they reduce the ultimate strength and the long-term adhesiveness of the concrete.
Such known accelerators customarily comprise a relatively high amount of organic carboxylic acids, which in particular makes production more expensive.
Other disadvantages of such solidification and hardening accelerators, moreover, lie in a relatively low early strength within the first hours, and the often inadequate storage stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

working examples

1. Production of Accelerators

[0095]Various accelerators A1-A2 (inventive) and B1-B11 (comparative tests) were produced, with the compositions described in table 1. In each case the water was introduced at room temperature (about 20° C.), the magnesium hydroxide was slurried in this water, and the acid or acids identified in table 1 (quantity figure based in each case on pure acid(s) or active substance) were added, producing an increase in the temperature of the solution. Thereafter the aluminum sulfate (17% Al2O3) and the aluminum hydroxide (amorphous) were added and dissolved at elevated temperature. The solution was then stirred until, after about an hour, the temperature had dropped to about 40° C. The accelerators thus are present in the form of clear solutions with in some cases finely dispersed particles.

TABLE 1Accelerator compositions (all amounts in wt %)Al(OH)3Acid(s) / No.H2O(amorphous)Al2(SO4)3•14 H2OMg(OH)2Fraction(s)A145.7015.6037.001.00Citric acid / 0.50Ascorbic acid / 0.20...

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Abstract

A solidification and setting accelerator for hydraulic binders, in particular for shotcrete / gunite or sprayed mortar, comprises sulfate, aluminum and at least two chemically distinct organic acids, each of which contains at least one hydroxy group in addition to at least one acid group, the combined maximum content of the at least two organic acids being 1 wt % in relation to the total weight of the accelerator.

Description

TECHNICAL FIELD[0001]The invention relates to a solidification and hardening accelerator for hydraulic binders, to a method for accelerating the solidification and hardening of hydraulic binders, and to the use of the solidification and hardening accelerator in hydraulic binders, more particularly in sprayed concrete or sprayed mortar. The invention further pertains to a binder-comprising mixture comprising the solidification and hardening accelerator, and also to a cured shaped article produced therefrom.PRIOR ART[0002]There are numerous known substances which accelerate the solidification and hardening of concrete. Commonplace, for example, are substances giving a strongly alkaline reaction, such as alkali metal hydroxides, alkali metal carbonates, alkali metal silicates, alkali metal aluminates, and alkaline earth metal chlorides. In the case of the substances giving a strongly alkaline reaction, however, unwanted harm to the user, such as burns, may occur, and they reduce the ul...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C04B22/14C04B28/04C04B40/00C04B22/06
CPCC04B22/148C04B22/06C04B22/066C04B2111/00146C04B40/0039C04B2103/14C04B28/04C04B28/02C04B2103/12C04B14/042C04B14/066C04B14/104C04B14/106C04B14/303C04B18/146C04B22/10C04B22/141C04B22/142C04B24/02C04B24/06C04B24/122C04B24/2647Y02W30/91
Inventor STENGER, CHRISTIAN
Owner SIKA TECH AG